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Cold-Model Study on the Maximum Penetration Distance of the Injection Lance in a Kaldo Furnace
Mining, Metallurgy & Exploration ( IF 1.9 ) Pub Date : 2020-02-27 , DOI: 10.1007/s42461-020-00197-7
Manuel Pérez-Tello , María M. Salazar-Campoy , Óscar Rodríguez-Hoyos

A common problem during the operation of the Kaldo furnace is the formation of accretions and blockage of the injection lance due to splashing. This typically occurs during the processing of anodic slimes for the production of doré. In this work, a 1:7 scale model of the Kaldo furnace currently in operation at Metalúrgica de Cobre, Mexico, was built in transparent acrylic plastic. Water and colored oil were used to represent the doré and slag, respectively. The model was used to determine the maximum penetration distance of the injection lance under a variety of experimental conditions at room temperature. Input variables included two types of oil, rotation speed, inclination angle, and the fraction of the vessel volume occupied by the liquids (φ). A mathematical correlation for the dimensionless maximum penetration distance of the injection lance d ∗ as a function of φ, the Froude number of the liquids in the vessel (Fr), the Reynolds number of the gas jet (Re), and the oil-to-water kinematic viscosity ratio (η) was developed. Reasonable agreement between the calculated and experimental values was obtained. Digital images showed that splashing was caused by the turbulent gas jet impinging upon the free surface of the liquids, whereas the cascade effect was negligible. The results of this work have been useful to improve the operation of an industrial Kaldo reactor.

中文翻译:

卡尔多炉注射枪最大穿透距离的冷模型研究

Kaldo 炉运行过程中的一个常见问题是由于飞溅而形成喷枪的堆积物和堵塞。这通常发生在处理阳极泥以生产 doré 的过程中。在这项工作中,目前在墨西哥 Metalúrgica de Cobre 运行的 Kaldo 炉的 1:7 比例模型是用透明丙烯酸塑料建造的。水和有色油分别用于代表doré 和slag。该模型用于确定室温下各种实验条件下注射枪的最大穿透距离。输入变量包括两种类型的油、转速、倾角和液体所占容器体积的比例 (φ)。喷射枪的无量纲最大穿透距离 d ∗ 作为 φ、容器中液体的弗劳德数 (Fr)、气体射流的雷诺数 (Re) 和油到-水运动粘度比(η)被开发出来。获得了计算值和实验值之间的合理一致性。数字图像显示飞溅是由湍流气体射流撞击液体自由表面引起的,而级联效应可以忽略不计。这项工作的结果有助于改进工业 Kaldo 反应器的运行。获得了计算值和实验值之间的合理一致性。数字图像显示飞溅是由湍流气体射流撞击液体自由表面引起的,而级联效应可以忽略不计。这项工作的结果有助于改进工业 Kaldo 反应器的运行。获得了计算值和实验值之间的合理一致性。数字图像显示飞溅是由湍流气体射流撞击液体自由表面引起的,而级联效应可以忽略不计。这项工作的结果有助于改进工业 Kaldo 反应器的运行。
更新日期:2020-02-27
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